April 17 (Reuters) - The S&P 500 posted its biggest
percentage loss since March 25 on Friday as investors shunned
risk amid new trading regulations in China, renewed worries
about Greece running out of money, and tepid U.S. corporate
earnings.

Selling followed sharp overseas stocks declines and was
broad, with all 10 major S&P 500 sectors losing ground.

Among the biggest drags, the S&P financials index
was down 1.3 percent, with shares of Dow component American
Express falling 4.4 percent to $77.32 after revenue
missed analysts' estimates, partly due to the currency impact.

The Dow and S&P 500 both snapped two weeks of gains. For the
week, the Dow was down 1.3 percent, the S&P 500 down 1 percent
and the Nasdaq down 1.3 percent.
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